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. 2022 Sep 2;31(13):1667–1678. doi: 10.1007/s10068-022-01150-8

Fig. 1.

Fig. 1

Response surface plots and 2-dimensional contour lines for the effects of the extraction temperature (°C), extraction time (min), and ethanol concentration (%) on the extraction yield (%, Y1), TPC (mg GAE/g DW, Y2), TFC (mg NAE/g DW, Y3), and DPPH radical scavenging activity (% Inhibition, Y4) of RPEs